In a medium sized saucepan fry the shallot until lightly brown.
Add the peas, sugar and pour in the vegetable stock. Bring to the boil and cook until the peas are tender (a few minutes or more).
Take off the heat and strain the ingredients and set aside the cooking liquid.
Place the peas and shallots in a blender, add the mint and a few tablespoons of the cooking liquid.
Blend to a purée, adding more cooking liquid or add a bit more warm water if necessary.
Season with salt and pepper, to taste.